21012432430 has 32 divisors (see below), whose sum is σ = 41320637568. Its totient is φ = 7629799200.

The previous prime is 21012432407. The next prime is 21012432433. The reversal of 21012432430 is 3423421012.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012432433) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62212 + ... + 214231.

It is an arithmetic number, because the mean of its divisors is an integer number (1291269924).

Almost surely, 2^21012432430 is an apocalyptic number.

21012432430 is a deficient number, since it is larger than the sum of its proper divisors (20308205138).

21012432430 is a wasteful number, since it uses less digits than its factorization.

21012432430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277152.

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 21012432430 its reverse (3423421012), we get a palindrome (24435853442).

The spelling of 21012432430 in words is "twenty-one billion, twelve million, four hundred thirty-two thousand, four hundred thirty".